Most devices can be configured for Tivoli Storage Manager using the Device Configuration Wizard in the TSM Server Utilities. The Device Configuration Wizard is recommended for configuring devices. The wizard defines the storage objects that the server requires to manage the storage environment. See Chapter 4, "Adding Devices to Tivoli Storage Manager".
Businesses often back up data to a variety of storage devices ranging from high-performance disk devices to slower and less expensive tape devices. Administrators must balance the data availability requirements of users with the costs of storage devices.
This section discusses how to evaluate your current environment to determine the device classes and storage pools for your server storage.
Before configuring devices, evaluate the hardware available to the server.
Note: | The Server Utilities includes a Device Configuration wizard that guides you through many of the following steps for TSM-supported devices. |
TSM servers can share devices in libraries that are attached via a storage area network (SAN). If the devices are not on a SAN, the server expects to have exclusive use of the drives defined to it. If another application (including another TSM server) tries to use a drive while the server to which the drive is defined is running, some server functions may fail.
Note: | For sequential access devices, categorize the type of removable media based on capacity. For example, standard length cartridge tapes and longer length cartridge tapes require different device classes. |
Devices that require operators to load volumes must be part of a MANUAL library defined to TSM.
Devices that are automatically loaded must be part of a SCSI, 349X, or SHARED library defined to TSM. Each automated library device is a separate TSM library.
Devices that are managed by an external media management system must be part of an EXTERNAL library defined to TSM.
Also consider the storage resources available on the target server. Ensure that the target server has enough storage space and drives to handle the load from the source server.
As an example of mapping devices to device classes, assume you have the following devices to use for server storage:
You can map storage devices to device classes as shown in Table 30.
Table 30. Mapping Storage Devices to Device Classes
Device Class | Description |
---|---|
DISK | Storage volumes that reside on the internal disk drive
TSM provides one DISK device class that is already defined. You do not need and cannot define another device class for disk storage. |
8MM_CLASS | Storage volumes that are 8mm tapes, used with the drives in the automated library |
DLT_CLASS | Storage volumes that are DLT tapes, used on the DLT drive |
You must define any device classes that you need for your removable media devices such as tape drives. See Chapter 7, Defining Device Classes for information on defining device classes to support your physical storage environment.
After you have categorized your storage devices, identify availability, space, and performance requirements for client data that is stored in server storage. These requirements help you determine where to store data for different groups of clients and different types of data. You can then create storage pools that are storage destinations for backed-up, archived, or space-managed files to match requirements.
For example, you determine that users in the business department have three requirements:
These files should be stored on disk. However, you need to ensure that data is moved from the disk to prevent it from becoming full. You can set up a storage hierarchy so that files can migrate automatically from disk to the automated tape library.
These files can be stored on 8mm tapes, using the automated library.
These files can be stored using the DLT drive.
To match user requirements to storage devices, you define storage pools,
device classes, and, for device types that require them, libraries and
drives. To set up the storage hierarchy so that data migrates from the
BACKUPPOOL to 8mm tapes, you specify BACKTAPE1 as the next storage pool for
BACKUPPOOL. See Table 31.
Table 31. Mapping Storage Pools to Device Classes, Libraries, and Drives
Storage Pool | Device Class | Library (Hardware) | Drives | Volume Type | Storage Destination | ||
---|---|---|---|---|---|---|---|
BACKUPPOOL | DISK | -- | -- | Storage volumes on the internal disk drive | For a backup copy group for files requiring immediate access | ||
BACKTAPE1 | 8MM_CLASS | AUTO_8MM (lb1.0.0.0) | mt0.0.0.0, mt1.0.0.0 | 8mm tapes | For overflow from the BACKUPPOOL and for archived data that is periodically accessed | ||
BACKTAPE2 | DLT_CLASS | MANUAL_LIB (Manually mounted) | mt3.0.0.0 (DLT) | DLT tapes | For backup copy groups for files that are occasionally accessed | ||
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Before a device can be used by TSM, the device must be configured to the operating system as well as to TSM. Table 32 summarizes the TSM definitions that are required for different device types. For information on configuring devices, see the following sections:
Table 32. Required TSM Definitions for Storage Devices
For devices that use removable media, you must choose a library type when you configure the devices. TSM uses the library type to determine how volume mount operations are controlled on the drives in that library. The TSM library types are:
In a MANUAL library, an operator mounts the volumes. Define a MANUAL library if you have one or more drives for which operators must mount volumes (drives that are not part of an automated library). You can combine drives with different device types, such as DLT and 8MM, in a single MANUAL library.
When the TSM server determines that a volume needs to be mounted in a drive that is part of a MANUAL library, the server issues mount request messages that prompt an operator to mount the volume. The server sends these messages to the server console and to administrative clients that were started by using the special mount mode or console mode parameter.
For help on configuring a MANUAL library, see Chapter 4, Adding Devices to Tivoli Storage Manager. For information on how to monitor mount messages for a MANUAL library, see Managing Media Mount Operations.
A SCSI library is a collection of drives for which volume mounts and demounts are handled automatically by a robot or other mechanism. This type applies to automated libraries that are attached via a SCSI interface (other than the IBM 3494). The Exabyte EXB-210 is an example. When you define a SCSI library to the TSM server, you must specify the library device name. To mount and dismount a volume in a drive that resides in the SCSI library, TSM uses the library name.
For help on configuring a SCSI library, see Chapter 4, Adding Devices to Tivoli Storage Manager. For an example of how to add volumes to a SCSI library, see Preparing Media for Automated Library Devices.
A 349X library is a collection of drives in an IBM 3494 Tape Library Dataserver. Volume mounts and demounts are handled automatically by the automation in the library.
Note: | For each 3494, you can define only one TSM library. |
For help on configuring a 349X library, see Chapter 4, Adding Devices to Tivoli Storage Manager. For an example of how to add volumes to a 349X library, see Checking Volumes into 3494 Library Devices.
An EXTERNAL library is a collection of drives managed by a media management system that is not part of TSM. TSM provides an interface that allows external media management systems to operate in conjunction with the TSM server. To use the interface for one or more devices, you must define a library with library type EXTERNAL.
For EXTERNAL libraries, TSM uses the external media management system to perform the following functions:
The external media manager selects the appropriate drive for media access operations. You do not define the drives in an EXTERNAL library to TSM.
When you issue the MOVE MEDIA or MOVE DRMEDIA command for media in EXTERNAL libraries, TSM uses the external media management system to perform the following functions:
The EXTERNAL library type allows flexibility in grouping drives into libraries and storage pools. An EXTERNAL library may be one drive, a collection of drives, or even a part of an automated library.
For a definition of the interface that TSM provides to the external media management system, see Appendix B, External Media Management Interface Description.
A SHARED library is a collection of drives in a library that is attached via a storage area network (SAN). TSM servers can share the drives in the library. One TSM server acts as the library manager to control media mounts and other operations. Other servers that share the drives are called library clients. For details, see Configuring TSM Servers to Share SAN-Connected Devices.
An RSM library is a collection of media managed by the Microsoft Removable Storage Manager (RSM), which is not part of TSM. RSM is a Microsoft Management Console snap-in that provides administrators with a common interface for tracking removable storage media, and managing automated library devices. To use RSM for one or more TSM devices, you must define a library with library type RSM.
See Using Removable Media Managers With Tivoli Storage Manager for details.